No I don't think it will replace fiat as the governments just won't approve due to the lack of control they can have with Bitcoin. But hey I can be wrong, anything can happen in this strange little world.
I like your open mindedness. I will just remind you quicky, don't forget American govt. tried to control the circulation of gold in the 17th century and placed some policy to limit its distribution.
Morale lesson: Nothing great comes through easily, without criticism and scam about it.